Effects of Cooperative Learning on Students’ Understanding of Metallic Bonding

The present study focused on investigating the effectiveness of instruction via newly developed teaching materials based on cooperative learning when compared to a traditional approach, on ninth grade students’ understanding of metallic bonding. Fifty-seven ninth grade science students from two science classes in the same high school participated in this study. The same teacher taught metallic bonding with cooperative learning to an experimental group (N = 28) and with a traditional teacher centred approach to a control group (N = 29). Students’ conceptual understanding of metallic bonding was measured using the Metallic Bonding Concept Test. The results from the Student’s t test indicated that the mean score of the students in the experimental group was significantly higher in the experimental group (78.60, SD = 8.62), than in the control group (54.33, SD = 9.11) after treatment. In the light of the results from the concept test and individual interviews, the misconceptions related to metallic bonding were found less in the experimental group than traditional. Five of these misconceptions were firstly identified in this study. The individual interviews which were done with students from experimental group immediately after the instruction showed that students had positive perceptions about their cooperative work experiences.     

三元配合物高灵敏显色反应的研究与应用——钴（Ⅲ）—亚硝基R盐—甲基紫体系

本文研究了在稀盐酸介质中，钴（Ⅲ）与亚硝基Ｒ盐所形成的配合阴离子可以与有机碱阳离子（甲基紫）缔合形成中性缔合分子。在聚乙烯醇存在下，配合物可稳定存在于溶液中。经直线法和平衡移动法测定，配合物中各组分的组成比为Ｃｏ∶Ｒ∶ＭＶ＝１∶３∶６。摩尔吸光系数ε５００＝１．５２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，采用双峰双波长法则摩尔吸光系数ε５００－６１０＝３．７４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。钴浓度在０～３．０μｇ／２５ｍｌ范围内符合比尔定律。方法用于茶叶、维生素Ｂ１２、分子筛中钴的测定，结果满意     

稳恒电磁场中的坡印廷定理和I~2R发热的另一种解释

把时变电磁场中的坡印廷定理引入至稳恒电磁场中 ,在稳恒电磁场中分析穿过导体表面的能量流动问题 ,并对通常人们所熟悉的 I2 R发热问题提供一种新的解释     

Exploring the links between students' engagement in cooperative learning, their goal preferences and appraisals of instructional conditions in the classroom

Previous research suggested that social support, belongingness and mastery goals were related to the quality of cooperative learning (CL). In this in-depth study we explored how to differentiate between four effective CL teams and four ineffective CL teams, in terms of students' goals and perceptions of instructional conditions. Apart from the earlier mentioned goals we found students' preference for social responsibility, learning for a certificate and entertainment goals to be salient in the CL setting. Mastery and social responsibility goals were prevalent in effective teams, while learning for a certificate and entertainment goals were prevalent in ineffective teams. Moreover, the type of task, group composition and teacher support were mentioned as reasons for effective or ineffective CL.     

协作学习评价方法

目前随着网络技术的发展和教学观念的变革 ,协作学习被视为极有发展和应用前景的网络教学策略之一 ,而协作学习的评价是亟待深入研究的问题。因此 ,该文主要阐述了协作学习评价的基本特点 ,并对协作学习评价的两个层面———小组评价和个体评价的具体方法进行了探讨     

Situated Knowledge and the Virtual Science and Industry Museum: Problems in the Social-Technical Interface

The Museum is a perspicuous site for analysing the complex interplay between social, organisational, cultural and political factors which have relevance to the design and use of virtual technologies. Specifically, the introduction of virtual technologies in museums runs up against the issue of the situated character of information use. Across a number of disciplines (anthropology, sociology, psychology, cognitive science) there is growing recognition of the situatedness of knowledge and its importance for the design and use of technology. This awareness is fostered by the fact that technological developments are often associated with disappointing gains for users. The effective use of technology relies on the degree to which it can be embedded in or congruent with the local practices of museum users. Drawing upon field research in two museums of science and technology, both of which are in the process of introducing virtual technologies and exploring the possibilities of on-line access, findings are presented which suggest that the success of such developments will depend on the extent to which they are informed by detailed understanding of practice-practices that are essentially socially constituted in the activities of museum visitors and the daily work of museum professionals.     

The effectiveness of a high-intensity games intervention on improving indices of health in young children

This study assessed the effectiveness of a 6-week, high-intensity, games-based intervention on physiological and anthropometric indices of health, in normal weight (n = 26; 32.5 ± 8.9 kg) and obese (n = 29; 49.3 ± 8.9 kg) children (n = 32 boys, 23 girls), aged 8–10 years. Children were randomised into an exercise or control group. The exercise group participated in a twice-weekly, 40 min active games intervention, alongside their usual school physical education classes. The control group did not take part in the intervention. Before and after the intervention, participants completed both a maximal and submaximal graded exercise test. The submaximal exercise test comprised of a 6 min, moderate- and 6 min heavy-intensity bout, interspersed with a 5 min recovery. The exercise group demonstrated improvements in maximal oxygen uptake (51.4 ± 8.5 vs 54.3 ± 9.6 ml · kg^?1 · min^?1) and peak running speed (11.3 ± 1.6 vs 11.9 ± 1.6 km · h^?1), and a reduction in the oxygen cost of submaximal exercise between assessments (P < .05). A decrease in waist circumference and increase in muscle mass were observed between assessments for the obese participants randomised to the intervention (both P < .05). This study demonstrates that a short-term, high-intensity games intervention may elicit positive changes in physiological and anthropometric indices of health in normal weight and obese children.     

“一带一路”经济区跨境电子商务平台发展路径研究

"一带一路"倡议的提出为沿线国家发展跨境电子商务提供了新的发展机遇。但沿线国家的跨境电商环境有着各自的特点,发展水平也差距极大,现有的跨境电商平台很难满足其发展需要。本文主要针对经济区内跨境电子商务活动开展中存在的主要症结进行了总结和梳理,并提出了在"一带一路"沿线国家间构筑跨境电商平台的主要路径,包括使用现有成熟平台,借助亚洲投资银行建立全新平台,通过多边协定建立平台等方法,最后,为"一带一路"沿线国家的发展跨境电子商务提供一些保障措施。     

广州区域总分馆制实施路径探索:以基层管理者为中心的研究

《广州市公共图书馆条例》为街镇图书馆引入了新的资源和政策保障,规划了相应的建设思路。广州公共图书馆区域总分馆体系建设实施中,街镇图书馆原有的建设主体以及管理主体是问题求解的关键。基于此,课题组选取10个具有代表性的街镇图书馆展开调研,对街镇图书馆基层管理者展开深度访谈,了解和分析他们对街镇图书馆价值及建设现状的认知,以及对以区域总分馆制为中心的街镇图书馆发展路线的不同态度。在此基础上,构建起三种不同的区域总分馆制实施路径:区图书馆主导,与镇政府/街道办、文化站共同建设和管理分馆;区图书馆直接建设、管理区域分馆;市图书馆扶持特定区域分馆。图1。表3。参考文献4。     

俄语翻译专业教学中教师的专业能力研究

随着经济全球化不断发展,中俄两国之间的交流逐渐频繁,对俄语专业翻译的人才需求量也在不断的增加。在俄语翻译专业的教学中,教师的专业能力要具备情感调节能力、自主学习能力、自我反思能力。本文主要对目前俄语翻译专业教师的教学能力的现状进行分析,并提出提高教师专业能力的相应策略。